[orx-marching-squares] Add orx-marching-squares module

orx-marching-squares/README.md

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+# orx-marching-squares
+
+Tools for extracting contours from functions
+
+## How to use it?
+
+`orx-marching-squares` provides the `findContours()` function
+
+```kotlin
+fun f(v: Vector2) = v.distanceTo(drawer.bounds.center) - 200.0
+val segments = findContours(::f, drawer.bounds, 16.0)
+drawer.lineSegments(segments)
+```
+
+With a small adjustment to the given function one can use `findContours` to find iso contours. The trick is to add a cosine over the distance function.
+
+```kotlin
+fun f(v: Vector2) = cos((v.distanceTo(drawer.bounds.center) / 100.0) * 2 * PI)
+val segments = findContours(::f, drawer.bounds.offsetEdges(32.0), 16.0)
+drawer.lineSegments(segments)
+```